CHAPTER 11 HOMEWORK SOLUTIONS 26. An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity and mole fraction of the ethylene glycol. 32. Calculate the molarity and mole fraction of acetone in a 1.00 m solution of acetone (CH3COCH3) in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the volumes of acetone and ethanol add.
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46. The vapor pressure of a solution containing 53.6 g of glycerin (C3H8O3) in 133.7 g of ethanol (C2H5OH) is 113 torr at 40 oC. Calculate the vapor pressure of pure ethanol at 40 oC assuming that glycerin is a nonvolatile, nonelectrolyte solute in ethanol. 50. A solution is prepared by mixing 0.0300 mol CH2Cl2and 0.0500 mol CH2Br2at 25 oC. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25 oC. At 25 oC, the vapor pressure of pure CH2Cl2and pure CH2Br2are 133 ad 11.4 torr, respectively.